The rescue began after William's helicopter crew, which he co-piloted, responded to a mayday call that went out around 2 a.m., when the Russian vessel's hull cracked due to inclement weather.

The team was able to save two men early Sunday morning from the chilly waters, and have been on the hunt for the remaining crew members--five of whom are still missing (the body of one of the crewmembers has already been recovered).

Rescue efforts are still underway, but Jim Green, a Coast Guard spokesman said, "We know that at least some of them are wearing immersion suits and have strobe lighting with them. However, sea conditions are challenging at best."

In addition to strong winds in the region, temperatures at sea are said to be a chilly 57 degrees.